*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html,body{
    width:100%;
    height: 100%;
    overflow-x: hidden;
    font-family: "微软雅黑";
    font-size:50px;
    margin:0;
    overflow-y:auto;
    -webkit-overflow-scrolling: touch;
    padding:0
}
img{
    width: 100%;
    display: block;
}
.bottom{
    position: relative;
}
.bg{
    position: absolute;
    top:0;
    left:0;
    width: 100%;
}
.btn{
    z-index: 100;
    position: absolute;
    top: 0;
    left: 9%;
    width: 84%;
}
